I have a 2005 suzuki forenza s. After starting the car, the smoke gradually comes out from the pipe, after 1 or 2 minutes, the smoke becomes really heavy and some smoke also comes under the hood. the color is kind of blue at first, after some time it turns to kind of white from the pipe. It doesn't smell like water vapor though. I've tried the engine compression test, all four cyclinders seems to have normal pressures. Not sure what I should do with it, see if anyone know what happens here.